Pneumohydraulic ram



March 13, 1945. LANGDON 2,371,450

PNEUMO HYDRAULIC RAM Filed Jam 4, 1943 Patented Mar. 13, 1945 I i it;

V PNEUMOHYDRAULIC RAM Jesse D. Langdon, Brooklyn, l Application January. 4, 1943, serial Ne; 471390 f 1 Claim. (or sip-51) UNITED STATES "PAT OFFICE" This invention relates to machines for voperwork W provided between ;the top of ram Rand ating hydraulic rams of the class used for probutt plateBP. q I

duction where it is desired 'to extrude or shape A relatively largeand heavy check valve CC is materials using extremely high hydraulic presseated across a port in the lower end ofram sures and at the same time maintain a high speed ii cylinder RC communicating with reservoir rate of production. A'pump inlet PI communicates with high pres- The primary object of the invention is to prosure pump HP which is adapted to deliver liquid vide a machine using combined means whereby to high pressure chamber PC via liquid pressure air or other pneumatic pressure is used to transoutlet PO from high pressure pump HP which fer liquid rapidly from a reservoir into a ram W has a piston of relatively very small diameter chamber including means to trap the liquid in compared to the diameter of the ram R.

said ram chamber and means to build up addi- Valve handle I controls the passage of air tional hydraulic pressure in said ram chamber pressure through the supply line from air storage to any desired extent in addition to or independreservoir A. The air enters the pneumatic chament of the pneumatic pressure required to force ber above the liquid in said reservoir. A discharge liquid into said ram chamber from a reservoir check Valve 2 controls the passage of th hi h together with means to bleed the pressure from pressure liquid from reservoir 5 via high presthe ram chamber and bring the rain to a normal s re pu p HP into s e ham e C- Valve position of rest after moving the ram from normal 0 handle 3 controls relief valve RV which is threadposition. edly disposed in valve port VP through check Another object is to provide means to easily. Valve The stem of reliefvalve RV D O- relieve extremely high pressure from the ram vided with a shoulder 3s spaced above the and chamber through a bypass between the ram of the male nut 3n which serves as a rest for chamber and the reservoir. shoulder 3s when crank 3 has been turned in an A further object is to recover and reuse the 25 anticlockwise direction for a predetermined disliquid in the reservoir and exhaust the gas prestance to bleed chamber PC pr to uns a in sure from the reservoir to allow the ram to reeck Valve Q T e check valve G0 has two turn to normal position after being moved and reguides to prev n otat on projectin ownward turn the liquid to the reservoir. through the spider S, which is integral with the other and further obje ts of th i venti will valve seat surrounding it and acts as a guide for appear as the specification proceeds. the stem f relief valve RV which normally closes The drawing is schematic and shows only one Valve Po t P. form of structure which may b changed b r Starting with all valves closed the device is duction to practice to any form within the scope Operated as f Valve l is Opened pe tt of the laim, air pressure from storage to enter reservoir Sand Of the drawingc act against the surface of the liquid forcing the Figure 1 is a diagrammatic elevation of the am t rou h large sized ram p r R a n am liquid reservoir or tank 5 cut away to show R i k y ai st Work W. When ram Breaches schematic arrangement of form and parts there- 40 h 1 the limit f pneumatic pr s e against in liquid and work W abutting against butt-plate Figure 2 is a detailed sectional view of relief P, then the Va e CC d ops 0 S W We t to valve RV with adjacent fragmentary portions of seat across ram port RP. Check valve 2 is proassembly. vided with a handle to open same if desired. The structure involving the invention com- O from high pressure p p HP which by the prises a reservoir or tank 5 having liquid therein use of lever L immediately draws liquid from up toapredetermined level leaving aspace above reservoir 5 and forces same intp chamber PC the liquid for the admission of any suitable pneuwhere liquid pressure is built up to any desired m'atic pressure in the storage tank A providing point. The liquid in chamber PC being of an volume storage space supplied by means of coman incompressible nature provides the required Presser C pressure medium quickly forcing ram R solidly Adjacent to tank 5 and communicating therehome and a very small volume of liquid is rewith is a ram cylinder RC embraced longiquired to complete the work W, while the pneutudinally by a frame F which is attached to and matic pressure such as air or the like provides an supports a butt plate BP there being-a space for 65 elastic quick moving comparatively frictionless of substantial dimension;

low pressure medium for the initial movement of liquid from reservoir 5 for operation of the ram R to abut the work. The work is released by the operation of valve RV and the anticlockwise movement of crank 3 which opens valve port VP and allows pressure fluid in pressure chamber PC and reservoir 5 to become equalized. Thereafter further rotation of the crank 3 causes shoulder (is to impinge nut 3n thereby jacking the valve Gc-fromiits=seat andiallowing .the ram R to return by gravity to:its seat whemva-lve'Av is closed by handle I and blow out valve B is opened exhausting the air pressure from cham her 5. All valves are again closed and the ram is ready for further operation.

Therefore it will be seen that a quick transfer:

ameter oi the ram and seating across a port only slightly smaller in area than the check valve, said check valve being substantially in alignment with the ram and being held against rotation and guided in alignment with the port, a passage thru said check valve, bleeder valve means disposed to close said passage, means to open said bleeder and said check valve in succession, said port communicating with a rservoir filled with liquid *to. a pre-determined level,, theliquid level lintlie reservoir definingione' siderof'a pneumatic pressure chamber, a valve controlled pneumatic pressure supply line communicating with the from pneumatic to straight hydraulic actuation v for the ram R is attained andthe per formanceiof work speeded up.

ticns thereof 'tlie'- follbwiirg": claimis made.

A pneumohydraulic ram comprising at cytinder: a" ram-pistonxin:thevcylinden aaliuuid filled space .lielowmkie'ram; acheclivaive belbwvthezram approximating the di pneumatic chamber, a liquid conduit communicatin"g= between the reservoir and said liquid filled spacesabovathe check valve, a pump for forcing liquid thru said conduit to said space to boost the: liquid pressure in the space under the ram, whereby, liquid is pneumatically urged from the reservoir into the liquid space for rapid movement of the ram: and; an? increasedi liquid pressure is forcedl-intb saidrliquidspaceEby=thepump to m'ove the ramzagainstianwwcrkiwithlincreaised forcez" JESSE-3 D. GDON. 

